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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.annotations.GwtCompatible;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import com.google.common.annotations.GwtIncompatible;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.io.InvalidObjectException;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.io.ObjectInputStream;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.io.Serializable;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.ArrayList;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.Arrays;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.Collection;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.Collections;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.Comparator;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.Iterator;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.util.List;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.util.NavigableSet;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.util.SortedSet;<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>import javax.annotation.Nullable;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>/**<a name="line.40"></a>
<span class="sourceLineNo">041</span> * An immutable {@code SortedSet} that stores its elements in a sorted array.<a name="line.41"></a>
<span class="sourceLineNo">042</span> * Some instances are ordered by an explicit comparator, while others follow the<a name="line.42"></a>
<span class="sourceLineNo">043</span> * natural sort ordering of their elements. Either way, null elements are not<a name="line.43"></a>
<span class="sourceLineNo">044</span> * supported.<a name="line.44"></a>
<span class="sourceLineNo">045</span> *<a name="line.45"></a>
<span class="sourceLineNo">046</span> * &lt;p&gt;Unlike {@link Collections#unmodifiableSortedSet}, which is a &lt;i&gt;view&lt;/i&gt;<a name="line.46"></a>
<span class="sourceLineNo">047</span> * of a separate collection that can still change, an instance of {@code<a name="line.47"></a>
<span class="sourceLineNo">048</span> * ImmutableSortedSet} contains its own private data and will &lt;i&gt;never&lt;/i&gt;<a name="line.48"></a>
<span class="sourceLineNo">049</span> * change. This class is convenient for {@code public static final} sets<a name="line.49"></a>
<span class="sourceLineNo">050</span> * ("constant sets") and also lets you easily make a "defensive copy" of a set<a name="line.50"></a>
<span class="sourceLineNo">051</span> * provided to your class by a caller.<a name="line.51"></a>
<span class="sourceLineNo">052</span> *<a name="line.52"></a>
<span class="sourceLineNo">053</span> * &lt;p&gt;The sets returned by the {@link #headSet}, {@link #tailSet}, and<a name="line.53"></a>
<span class="sourceLineNo">054</span> * {@link #subSet} methods share the same array as the original set, preventing<a name="line.54"></a>
<span class="sourceLineNo">055</span> * that array from being garbage collected. If this is a concern, the data may<a name="line.55"></a>
<span class="sourceLineNo">056</span> * be copied into a correctly-sized array by calling {@link #copyOfSorted}.<a name="line.56"></a>
<span class="sourceLineNo">057</span> *<a name="line.57"></a>
<span class="sourceLineNo">058</span> * &lt;p&gt;&lt;b&gt;Note on element equivalence:&lt;/b&gt; The {@link #contains(Object)},<a name="line.58"></a>
<span class="sourceLineNo">059</span> * {@link #containsAll(Collection)}, and {@link #equals(Object)}<a name="line.59"></a>
<span class="sourceLineNo">060</span> * implementations must check whether a provided object is equivalent to an<a name="line.60"></a>
<span class="sourceLineNo">061</span> * element in the collection. Unlike most collections, an<a name="line.61"></a>
<span class="sourceLineNo">062</span> * {@code ImmutableSortedSet} doesn't use {@link Object#equals} to determine if<a name="line.62"></a>
<span class="sourceLineNo">063</span> * two elements are equivalent. Instead, with an explicit comparator, the<a name="line.63"></a>
<span class="sourceLineNo">064</span> * following relation determines whether elements {@code x} and {@code y} are<a name="line.64"></a>
<span class="sourceLineNo">065</span> * equivalent: &lt;pre&gt;   {@code<a name="line.65"></a>
<span class="sourceLineNo">066</span> *<a name="line.66"></a>
<span class="sourceLineNo">067</span> *   {(x, y) | comparator.compare(x, y) == 0}}&lt;/pre&gt;<a name="line.67"></a>
<span class="sourceLineNo">068</span> *<a name="line.68"></a>
<span class="sourceLineNo">069</span> * With natural ordering of elements, the following relation determines whether<a name="line.69"></a>
<span class="sourceLineNo">070</span> * two elements are equivalent: &lt;pre&gt;   {@code<a name="line.70"></a>
<span class="sourceLineNo">071</span> *<a name="line.71"></a>
<span class="sourceLineNo">072</span> *   {(x, y) | x.compareTo(y) == 0}}&lt;/pre&gt;<a name="line.72"></a>
<span class="sourceLineNo">073</span> *<a name="line.73"></a>
<span class="sourceLineNo">074</span> * &lt;b&gt;Warning:&lt;/b&gt; Like most sets, an {@code ImmutableSortedSet} will not<a name="line.74"></a>
<span class="sourceLineNo">075</span> * function correctly if an element is modified after being placed in the set.<a name="line.75"></a>
<span class="sourceLineNo">076</span> * For this reason, and to avoid general confusion, it is strongly recommended<a name="line.76"></a>
<span class="sourceLineNo">077</span> * to place only immutable objects into this collection.<a name="line.77"></a>
<span class="sourceLineNo">078</span> *<a name="line.78"></a>
<span class="sourceLineNo">079</span> * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; Although this class is not final, it cannot be subclassed as<a name="line.79"></a>
<span class="sourceLineNo">080</span> * it has no public or protected constructors. Thus, instances of this type are<a name="line.80"></a>
<span class="sourceLineNo">081</span> * guaranteed to be immutable.<a name="line.81"></a>
<span class="sourceLineNo">082</span> *<a name="line.82"></a>
<span class="sourceLineNo">083</span> * &lt;p&gt;See the Guava User Guide article on &lt;a href=<a name="line.83"></a>
<span class="sourceLineNo">084</span> * "http://code.google.com/p/guava-libraries/wiki/ImmutableCollectionsExplained"&gt;<a name="line.84"></a>
<span class="sourceLineNo">085</span> * immutable collections&lt;/a&gt;.<a name="line.85"></a>
<span class="sourceLineNo">086</span> *<a name="line.86"></a>
<span class="sourceLineNo">087</span> * @see ImmutableSet<a name="line.87"></a>
<span class="sourceLineNo">088</span> * @author Jared Levy<a name="line.88"></a>
<span class="sourceLineNo">089</span> * @author Louis Wasserman<a name="line.89"></a>
<span class="sourceLineNo">090</span> * @since 2.0 (imported from Google Collections Library; implements {@code NavigableSet} since 12.0)<a name="line.90"></a>
<span class="sourceLineNo">091</span> */<a name="line.91"></a>
<span class="sourceLineNo">092</span>// TODO(benyu): benchmark and optimize all creation paths, which are a mess now<a name="line.92"></a>
<span class="sourceLineNo">093</span>@GwtCompatible(serializable = true, emulated = true)<a name="line.93"></a>
<span class="sourceLineNo">094</span>@SuppressWarnings("serial") // we're overriding default serialization<a name="line.94"></a>
<span class="sourceLineNo">095</span>public abstract class ImmutableSortedSet&lt;E&gt; extends ImmutableSortedSetFauxverideShim&lt;E&gt;<a name="line.95"></a>
<span class="sourceLineNo">096</span>    implements NavigableSet&lt;E&gt;, SortedIterable&lt;E&gt; {<a name="line.96"></a>
<span class="sourceLineNo">097</span><a name="line.97"></a>
<span class="sourceLineNo">098</span>  private static final Comparator&lt;Comparable&gt; NATURAL_ORDER =<a name="line.98"></a>
<span class="sourceLineNo">099</span>      Ordering.natural();<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>  private static final ImmutableSortedSet&lt;Comparable&gt; NATURAL_EMPTY_SET =<a name="line.101"></a>
<span class="sourceLineNo">102</span>      new EmptyImmutableSortedSet&lt;Comparable&gt;(NATURAL_ORDER);<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>  @SuppressWarnings("unchecked")<a name="line.104"></a>
<span class="sourceLineNo">105</span>  private static &lt;E&gt; ImmutableSortedSet&lt;E&gt; emptySet() {<a name="line.105"></a>
<span class="sourceLineNo">106</span>    return (ImmutableSortedSet&lt;E&gt;) NATURAL_EMPTY_SET;<a name="line.106"></a>
<span class="sourceLineNo">107</span>  }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>  static &lt;E&gt; ImmutableSortedSet&lt;E&gt; emptySet(<a name="line.109"></a>
<span class="sourceLineNo">110</span>      Comparator&lt;? super E&gt; comparator) {<a name="line.110"></a>
<span class="sourceLineNo">111</span>    if (NATURAL_ORDER.equals(comparator)) {<a name="line.111"></a>
<span class="sourceLineNo">112</span>      return emptySet();<a name="line.112"></a>
<span class="sourceLineNo">113</span>    } else {<a name="line.113"></a>
<span class="sourceLineNo">114</span>      return new EmptyImmutableSortedSet&lt;E&gt;(comparator);<a name="line.114"></a>
<span class="sourceLineNo">115</span>    }<a name="line.115"></a>
<span class="sourceLineNo">116</span>  }<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span>  /**<a name="line.118"></a>
<span class="sourceLineNo">119</span>   * Returns the empty immutable sorted set.<a name="line.119"></a>
<span class="sourceLineNo">120</span>   */<a name="line.120"></a>
<span class="sourceLineNo">121</span>  public static &lt;E&gt; ImmutableSortedSet&lt;E&gt; of() {<a name="line.121"></a>
<span class="sourceLineNo">122</span>    return emptySet();<a name="line.122"></a>
<span class="sourceLineNo">123</span>  }<a name="line.123"></a>
<span class="sourceLineNo">124</span><a name="line.124"></a>
<span class="sourceLineNo">125</span>  /**<a name="line.125"></a>
<span class="sourceLineNo">126</span>   * Returns an immutable sorted set containing a single element.<a name="line.126"></a>
<span class="sourceLineNo">127</span>   */<a name="line.127"></a>
<span class="sourceLineNo">128</span>  public static &lt;E extends Comparable&lt;? super E&gt;&gt; ImmutableSortedSet&lt;E&gt; of(<a name="line.128"></a>
<span class="sourceLineNo">129</span>      E element) {<a name="line.129"></a>
<span class="sourceLineNo">130</span>    return new RegularImmutableSortedSet&lt;E&gt;(<a name="line.130"></a>
<span class="sourceLineNo">131</span>        ImmutableList.of(element), Ordering.natural());<a name="line.131"></a>
<span class="sourceLineNo">132</span>  }<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>  /**<a name="line.134"></a>
<span class="sourceLineNo">135</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.135"></a>
<span class="sourceLineNo">136</span>   * their natural ordering. When multiple elements are equivalent according to<a name="line.136"></a>
<span class="sourceLineNo">137</span>   * {@link Comparable#compareTo}, only the first one specified is included.<a name="line.137"></a>
<span class="sourceLineNo">138</span>   *<a name="line.138"></a>
<span class="sourceLineNo">139</span>   * @throws NullPointerException if any element is null<a name="line.139"></a>
<span class="sourceLineNo">140</span>   */<a name="line.140"></a>
<span class="sourceLineNo">141</span>  @SuppressWarnings("unchecked")<a name="line.141"></a>
<span class="sourceLineNo">142</span>  public static &lt;E extends Comparable&lt;? super E&gt;&gt; ImmutableSortedSet&lt;E&gt; of(<a name="line.142"></a>
<span class="sourceLineNo">143</span>      E e1, E e2) {<a name="line.143"></a>
<span class="sourceLineNo">144</span>    return copyOf(Ordering.natural(), Arrays.asList(e1, e2));<a name="line.144"></a>
<span class="sourceLineNo">145</span>  }<a name="line.145"></a>
<span class="sourceLineNo">146</span><a name="line.146"></a>
<span class="sourceLineNo">147</span>  /**<a name="line.147"></a>
<span class="sourceLineNo">148</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.148"></a>
<span class="sourceLineNo">149</span>   * their natural ordering. When multiple elements are equivalent according to<a name="line.149"></a>
<span class="sourceLineNo">150</span>   * {@link Comparable#compareTo}, only the first one specified is included.<a name="line.150"></a>
<span class="sourceLineNo">151</span>   *<a name="line.151"></a>
<span class="sourceLineNo">152</span>   * @throws NullPointerException if any element is null<a name="line.152"></a>
<span class="sourceLineNo">153</span>   */<a name="line.153"></a>
<span class="sourceLineNo">154</span>  @SuppressWarnings("unchecked")<a name="line.154"></a>
<span class="sourceLineNo">155</span>  public static &lt;E extends Comparable&lt;? super E&gt;&gt; ImmutableSortedSet&lt;E&gt; of(<a name="line.155"></a>
<span class="sourceLineNo">156</span>      E e1, E e2, E e3) {<a name="line.156"></a>
<span class="sourceLineNo">157</span>    return copyOf(Ordering.natural(), Arrays.asList(e1, e2, e3));<a name="line.157"></a>
<span class="sourceLineNo">158</span>  }<a name="line.158"></a>
<span class="sourceLineNo">159</span><a name="line.159"></a>
<span class="sourceLineNo">160</span>  /**<a name="line.160"></a>
<span class="sourceLineNo">161</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.161"></a>
<span class="sourceLineNo">162</span>   * their natural ordering. When multiple elements are equivalent according to<a name="line.162"></a>
<span class="sourceLineNo">163</span>   * {@link Comparable#compareTo}, only the first one specified is included.<a name="line.163"></a>
<span class="sourceLineNo">164</span>   *<a name="line.164"></a>
<span class="sourceLineNo">165</span>   * @throws NullPointerException if any element is null<a name="line.165"></a>
<span class="sourceLineNo">166</span>   */<a name="line.166"></a>
<span class="sourceLineNo">167</span>  @SuppressWarnings("unchecked")<a name="line.167"></a>
<span class="sourceLineNo">168</span>  public static &lt;E extends Comparable&lt;? super E&gt;&gt; ImmutableSortedSet&lt;E&gt; of(<a name="line.168"></a>
<span class="sourceLineNo">169</span>      E e1, E e2, E e3, E e4) {<a name="line.169"></a>
<span class="sourceLineNo">170</span>    return copyOf(Ordering.natural(), Arrays.asList(e1, e2, e3, e4));<a name="line.170"></a>
<span class="sourceLineNo">171</span>  }<a name="line.171"></a>
<span class="sourceLineNo">172</span><a name="line.172"></a>
<span class="sourceLineNo">173</span>  /**<a name="line.173"></a>
<span class="sourceLineNo">174</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.174"></a>
<span class="sourceLineNo">175</span>   * their natural ordering. When multiple elements are equivalent according to<a name="line.175"></a>
<span class="sourceLineNo">176</span>   * {@link Comparable#compareTo}, only the first one specified is included.<a name="line.176"></a>
<span class="sourceLineNo">177</span>   *<a name="line.177"></a>
<span class="sourceLineNo">178</span>   * @throws NullPointerException if any element is null<a name="line.178"></a>
<span class="sourceLineNo">179</span>   */<a name="line.179"></a>
<span class="sourceLineNo">180</span>  @SuppressWarnings("unchecked")<a name="line.180"></a>
<span class="sourceLineNo">181</span>  public static &lt;E extends Comparable&lt;? super E&gt;&gt; ImmutableSortedSet&lt;E&gt; of(<a name="line.181"></a>
<span class="sourceLineNo">182</span>      E e1, E e2, E e3, E e4, E e5) {<a name="line.182"></a>
<span class="sourceLineNo">183</span>    return copyOf(Ordering.natural(), Arrays.asList(e1, e2, e3, e4, e5));<a name="line.183"></a>
<span class="sourceLineNo">184</span>  }<a name="line.184"></a>
<span class="sourceLineNo">185</span><a name="line.185"></a>
<span class="sourceLineNo">186</span>  /**<a name="line.186"></a>
<span class="sourceLineNo">187</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.187"></a>
<span class="sourceLineNo">188</span>   * their natural ordering. When multiple elements are equivalent according to<a name="line.188"></a>
<span class="sourceLineNo">189</span>   * {@link Comparable#compareTo}, only the first one specified is included.<a name="line.189"></a>
<span class="sourceLineNo">190</span>   *<a name="line.190"></a>
<span class="sourceLineNo">191</span>   * @throws NullPointerException if any element is null<a name="line.191"></a>
<span class="sourceLineNo">192</span>   * @since 3.0 (source-compatible since 2.0)<a name="line.192"></a>
<span class="sourceLineNo">193</span>   */<a name="line.193"></a>
<span class="sourceLineNo">194</span>  @SuppressWarnings("unchecked")<a name="line.194"></a>
<span class="sourceLineNo">195</span>  public static &lt;E extends Comparable&lt;? super E&gt;&gt; ImmutableSortedSet&lt;E&gt; of(<a name="line.195"></a>
<span class="sourceLineNo">196</span>      E e1, E e2, E e3, E e4, E e5, E e6, E... remaining) {<a name="line.196"></a>
<span class="sourceLineNo">197</span>    int size = remaining.length + 6;<a name="line.197"></a>
<span class="sourceLineNo">198</span>    List&lt;E&gt; all = new ArrayList&lt;E&gt;(size);<a name="line.198"></a>
<span class="sourceLineNo">199</span>    Collections.addAll(all, e1, e2, e3, e4, e5, e6);<a name="line.199"></a>
<span class="sourceLineNo">200</span>    Collections.addAll(all, remaining);<a name="line.200"></a>
<span class="sourceLineNo">201</span>    return copyOf(Ordering.natural(), all);<a name="line.201"></a>
<span class="sourceLineNo">202</span>  }<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span>  // TODO(kevinb): Consider factory methods that reject duplicates<a name="line.204"></a>
<span class="sourceLineNo">205</span><a name="line.205"></a>
<span class="sourceLineNo">206</span>  /**<a name="line.206"></a>
<span class="sourceLineNo">207</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.207"></a>
<span class="sourceLineNo">208</span>   * their natural ordering. When multiple elements are equivalent according to<a name="line.208"></a>
<span class="sourceLineNo">209</span>   * {@link Comparable#compareTo}, only the first one specified is included.<a name="line.209"></a>
<span class="sourceLineNo">210</span>   *<a name="line.210"></a>
<span class="sourceLineNo">211</span>   * @throws NullPointerException if any of {@code elements} is null<a name="line.211"></a>
<span class="sourceLineNo">212</span>   * @since 3.0<a name="line.212"></a>
<span class="sourceLineNo">213</span>   */<a name="line.213"></a>
<span class="sourceLineNo">214</span>  public static &lt;E extends Comparable&lt;? super E&gt;&gt; ImmutableSortedSet&lt;E&gt; copyOf(<a name="line.214"></a>
<span class="sourceLineNo">215</span>      E[] elements) {<a name="line.215"></a>
<span class="sourceLineNo">216</span>    return copyOf(Ordering.natural(), Arrays.asList(elements));<a name="line.216"></a>
<span class="sourceLineNo">217</span>  }<a name="line.217"></a>
<span class="sourceLineNo">218</span><a name="line.218"></a>
<span class="sourceLineNo">219</span>  /**<a name="line.219"></a>
<span class="sourceLineNo">220</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.220"></a>
<span class="sourceLineNo">221</span>   * their natural ordering. When multiple elements are equivalent according to<a name="line.221"></a>
<span class="sourceLineNo">222</span>   * {@code compareTo()}, only the first one specified is included. To create a<a name="line.222"></a>
<span class="sourceLineNo">223</span>   * copy of a {@code SortedSet} that preserves the comparator, call {@link<a name="line.223"></a>
<span class="sourceLineNo">224</span>   * #copyOfSorted} instead. This method iterates over {@code elements} at most<a name="line.224"></a>
<span class="sourceLineNo">225</span>   * once.<a name="line.225"></a>
<span class="sourceLineNo">226</span><a name="line.226"></a>
<span class="sourceLineNo">227</span>   *<a name="line.227"></a>
<span class="sourceLineNo">228</span>   * &lt;p&gt;Note that if {@code s} is a {@code Set&lt;String&gt;}, then {@code<a name="line.228"></a>
<span class="sourceLineNo">229</span>   * ImmutableSortedSet.copyOf(s)} returns an {@code ImmutableSortedSet&lt;String&gt;}<a name="line.229"></a>
<span class="sourceLineNo">230</span>   * containing each of the strings in {@code s}, while {@code<a name="line.230"></a>
<span class="sourceLineNo">231</span>   * ImmutableSortedSet.of(s)} returns an {@code<a name="line.231"></a>
<span class="sourceLineNo">232</span>   * ImmutableSortedSet&lt;Set&lt;String&gt;&gt;} containing one element (the given set<a name="line.232"></a>
<span class="sourceLineNo">233</span>   * itself).<a name="line.233"></a>
<span class="sourceLineNo">234</span>   *<a name="line.234"></a>
<span class="sourceLineNo">235</span>   * &lt;p&gt;Despite the method name, this method attempts to avoid actually copying<a name="line.235"></a>
<span class="sourceLineNo">236</span>   * the data when it is safe to do so. The exact circumstances under which a<a name="line.236"></a>
<span class="sourceLineNo">237</span>   * copy will or will not be performed are undocumented and subject to change.<a name="line.237"></a>
<span class="sourceLineNo">238</span>   *<a name="line.238"></a>
<span class="sourceLineNo">239</span>   * &lt;p&gt;This method is not type-safe, as it may be called on elements that are<a name="line.239"></a>
<span class="sourceLineNo">240</span>   * not mutually comparable.<a name="line.240"></a>
<span class="sourceLineNo">241</span>   *<a name="line.241"></a>
<span class="sourceLineNo">242</span>   * @throws ClassCastException if the elements are not mutually comparable<a name="line.242"></a>
<span class="sourceLineNo">243</span>   * @throws NullPointerException if any of {@code elements} is null<a name="line.243"></a>
<span class="sourceLineNo">244</span>   */<a name="line.244"></a>
<span class="sourceLineNo">245</span>  public static &lt;E&gt; ImmutableSortedSet&lt;E&gt; copyOf(<a name="line.245"></a>
<span class="sourceLineNo">246</span>      Iterable&lt;? extends E&gt; elements) {<a name="line.246"></a>
<span class="sourceLineNo">247</span>    // Hack around E not being a subtype of Comparable.<a name="line.247"></a>
<span class="sourceLineNo">248</span>    // Unsafe, see ImmutableSortedSetFauxverideShim.<a name="line.248"></a>
<span class="sourceLineNo">249</span>    @SuppressWarnings("unchecked")<a name="line.249"></a>
<span class="sourceLineNo">250</span>    Ordering&lt;E&gt; naturalOrder = (Ordering&lt;E&gt;) Ordering.&lt;Comparable&gt;natural();<a name="line.250"></a>
<span class="sourceLineNo">251</span>    return copyOf(naturalOrder, elements);<a name="line.251"></a>
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<span class="sourceLineNo">253</span><a name="line.253"></a>
<span class="sourceLineNo">254</span>  /**<a name="line.254"></a>
<span class="sourceLineNo">255</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.255"></a>
<span class="sourceLineNo">256</span>   * their natural ordering. When multiple elements are equivalent according to<a name="line.256"></a>
<span class="sourceLineNo">257</span>   * {@code compareTo()}, only the first one specified is included. To create a<a name="line.257"></a>
<span class="sourceLineNo">258</span>   * copy of a {@code SortedSet} that preserves the comparator, call<a name="line.258"></a>
<span class="sourceLineNo">259</span>   * {@link #copyOfSorted} instead. This method iterates over {@code elements}<a name="line.259"></a>
<span class="sourceLineNo">260</span>   * at most once.<a name="line.260"></a>
<span class="sourceLineNo">261</span>   *<a name="line.261"></a>
<span class="sourceLineNo">262</span>   * &lt;p&gt;Note that if {@code s} is a {@code Set&lt;String&gt;}, then<a name="line.262"></a>
<span class="sourceLineNo">263</span>   * {@code ImmutableSortedSet.copyOf(s)} returns an<a name="line.263"></a>
<span class="sourceLineNo">264</span>   * {@code ImmutableSortedSet&lt;String&gt;} containing each of the strings in<a name="line.264"></a>
<span class="sourceLineNo">265</span>   * {@code s}, while {@code ImmutableSortedSet.of(s)} returns an<a name="line.265"></a>
<span class="sourceLineNo">266</span>   * {@code ImmutableSortedSet&lt;Set&lt;String&gt;&gt;} containing one element (the given<a name="line.266"></a>
<span class="sourceLineNo">267</span>   * set itself).<a name="line.267"></a>
<span class="sourceLineNo">268</span>   *<a name="line.268"></a>
<span class="sourceLineNo">269</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; Despite what the method name suggests, if {@code elements}<a name="line.269"></a>
<span class="sourceLineNo">270</span>   * is an {@code ImmutableSortedSet}, it may be returned instead of a copy.<a name="line.270"></a>
<span class="sourceLineNo">271</span>   *<a name="line.271"></a>
<span class="sourceLineNo">272</span>   * &lt;p&gt;This method is not type-safe, as it may be called on elements that are<a name="line.272"></a>
<span class="sourceLineNo">273</span>   * not mutually comparable.<a name="line.273"></a>
<span class="sourceLineNo">274</span>   *<a name="line.274"></a>
<span class="sourceLineNo">275</span>   * &lt;p&gt;This method is safe to use even when {@code elements} is a synchronized<a name="line.275"></a>
<span class="sourceLineNo">276</span>   * or concurrent collection that is currently being modified by another<a name="line.276"></a>
<span class="sourceLineNo">277</span>   * thread.<a name="line.277"></a>
<span class="sourceLineNo">278</span>   *<a name="line.278"></a>
<span class="sourceLineNo">279</span>   * @throws ClassCastException if the elements are not mutually comparable<a name="line.279"></a>
<span class="sourceLineNo">280</span>   * @throws NullPointerException if any of {@code elements} is null<a name="line.280"></a>
<span class="sourceLineNo">281</span>   * @since 7.0 (source-compatible since 2.0)<a name="line.281"></a>
<span class="sourceLineNo">282</span>   */<a name="line.282"></a>
<span class="sourceLineNo">283</span>  public static &lt;E&gt; ImmutableSortedSet&lt;E&gt; copyOf(<a name="line.283"></a>
<span class="sourceLineNo">284</span>      Collection&lt;? extends E&gt; elements) {<a name="line.284"></a>
<span class="sourceLineNo">285</span>    // Hack around E not being a subtype of Comparable.<a name="line.285"></a>
<span class="sourceLineNo">286</span>    // Unsafe, see ImmutableSortedSetFauxverideShim.<a name="line.286"></a>
<span class="sourceLineNo">287</span>    @SuppressWarnings("unchecked")<a name="line.287"></a>
<span class="sourceLineNo">288</span>    Ordering&lt;E&gt; naturalOrder = (Ordering&lt;E&gt;) Ordering.&lt;Comparable&gt;natural();<a name="line.288"></a>
<span class="sourceLineNo">289</span>    return copyOf(naturalOrder, elements);<a name="line.289"></a>
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<span class="sourceLineNo">291</span><a name="line.291"></a>
<span class="sourceLineNo">292</span>  /**<a name="line.292"></a>
<span class="sourceLineNo">293</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.293"></a>
<span class="sourceLineNo">294</span>   * their natural ordering. When multiple elements are equivalent according to<a name="line.294"></a>
<span class="sourceLineNo">295</span>   * {@code compareTo()}, only the first one specified is included.<a name="line.295"></a>
<span class="sourceLineNo">296</span>   *<a name="line.296"></a>
<span class="sourceLineNo">297</span>   * &lt;p&gt;This method is not type-safe, as it may be called on elements that are<a name="line.297"></a>
<span class="sourceLineNo">298</span>   * not mutually comparable.<a name="line.298"></a>
<span class="sourceLineNo">299</span>   *<a name="line.299"></a>
<span class="sourceLineNo">300</span>   * @throws ClassCastException if the elements are not mutually comparable<a name="line.300"></a>
<span class="sourceLineNo">301</span>   * @throws NullPointerException if any of {@code elements} is null<a name="line.301"></a>
<span class="sourceLineNo">302</span>   */<a name="line.302"></a>
<span class="sourceLineNo">303</span>  public static &lt;E&gt; ImmutableSortedSet&lt;E&gt; copyOf(<a name="line.303"></a>
<span class="sourceLineNo">304</span>      Iterator&lt;? extends E&gt; elements) {<a name="line.304"></a>
<span class="sourceLineNo">305</span>    // Hack around E not being a subtype of Comparable.<a name="line.305"></a>
<span class="sourceLineNo">306</span>    // Unsafe, see ImmutableSortedSetFauxverideShim.<a name="line.306"></a>
<span class="sourceLineNo">307</span>    @SuppressWarnings("unchecked")<a name="line.307"></a>
<span class="sourceLineNo">308</span>    Ordering&lt;E&gt; naturalOrder = (Ordering&lt;E&gt;) Ordering.&lt;Comparable&gt;natural();<a name="line.308"></a>
<span class="sourceLineNo">309</span>    return copyOf(naturalOrder, elements);<a name="line.309"></a>
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<span class="sourceLineNo">311</span><a name="line.311"></a>
<span class="sourceLineNo">312</span>  /**<a name="line.312"></a>
<span class="sourceLineNo">313</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.313"></a>
<span class="sourceLineNo">314</span>   * the given {@code Comparator}. When multiple elements are equivalent<a name="line.314"></a>
<span class="sourceLineNo">315</span>   * according to {@code compareTo()}, only the first one specified is<a name="line.315"></a>
<span class="sourceLineNo">316</span>   * included.<a name="line.316"></a>
<span class="sourceLineNo">317</span>   *<a name="line.317"></a>
<span class="sourceLineNo">318</span>   * @throws NullPointerException if {@code comparator} or any of<a name="line.318"></a>
<span class="sourceLineNo">319</span>   *     {@code elements} is null<a name="line.319"></a>
<span class="sourceLineNo">320</span>   */<a name="line.320"></a>
<span class="sourceLineNo">321</span>  public static &lt;E&gt; ImmutableSortedSet&lt;E&gt; copyOf(<a name="line.321"></a>
<span class="sourceLineNo">322</span>      Comparator&lt;? super E&gt; comparator, Iterator&lt;? extends E&gt; elements) {<a name="line.322"></a>
<span class="sourceLineNo">323</span>    return copyOf(comparator, Lists.newArrayList(elements));<a name="line.323"></a>
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<span class="sourceLineNo">325</span><a name="line.325"></a>
<span class="sourceLineNo">326</span>  /**<a name="line.326"></a>
<span class="sourceLineNo">327</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.327"></a>
<span class="sourceLineNo">328</span>   * the given {@code Comparator}. When multiple elements are equivalent<a name="line.328"></a>
<span class="sourceLineNo">329</span>   * according to {@code compare()}, only the first one specified is<a name="line.329"></a>
<span class="sourceLineNo">330</span>   * included. This method iterates over {@code elements} at most once.<a name="line.330"></a>
<span class="sourceLineNo">331</span>   *<a name="line.331"></a>
<span class="sourceLineNo">332</span>   * &lt;p&gt;Despite the method name, this method attempts to avoid actually copying<a name="line.332"></a>
<span class="sourceLineNo">333</span>   * the data when it is safe to do so. The exact circumstances under which a<a name="line.333"></a>
<span class="sourceLineNo">334</span>   * copy will or will not be performed are undocumented and subject to change.<a name="line.334"></a>
<span class="sourceLineNo">335</span>   *<a name="line.335"></a>
<span class="sourceLineNo">336</span>   * @throws NullPointerException if {@code comparator} or any of {@code<a name="line.336"></a>
<span class="sourceLineNo">337</span>   *         elements} is null<a name="line.337"></a>
<span class="sourceLineNo">338</span>   */<a name="line.338"></a>
<span class="sourceLineNo">339</span>  public static &lt;E&gt; ImmutableSortedSet&lt;E&gt; copyOf(<a name="line.339"></a>
<span class="sourceLineNo">340</span>      Comparator&lt;? super E&gt; comparator, Iterable&lt;? extends E&gt; elements) {<a name="line.340"></a>
<span class="sourceLineNo">341</span>    checkNotNull(comparator);<a name="line.341"></a>
<span class="sourceLineNo">342</span>    boolean hasSameComparator =<a name="line.342"></a>
<span class="sourceLineNo">343</span>        SortedIterables.hasSameComparator(comparator, elements);<a name="line.343"></a>
<span class="sourceLineNo">344</span><a name="line.344"></a>
<span class="sourceLineNo">345</span>    if (hasSameComparator &amp;&amp; (elements instanceof ImmutableSortedSet)) {<a name="line.345"></a>
<span class="sourceLineNo">346</span>      @SuppressWarnings("unchecked")<a name="line.346"></a>
<span class="sourceLineNo">347</span>      ImmutableSortedSet&lt;E&gt; original = (ImmutableSortedSet&lt;E&gt;) elements;<a name="line.347"></a>
<span class="sourceLineNo">348</span>      if (!original.isPartialView()) {<a name="line.348"></a>
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<span class="sourceLineNo">351</span>    }<a name="line.351"></a>
<span class="sourceLineNo">352</span>    @SuppressWarnings("unchecked") // elements only contains E's; it's safe.<a name="line.352"></a>
<span class="sourceLineNo">353</span>    E[] array = (E[]) Iterables.toArray(elements);<a name="line.353"></a>
<span class="sourceLineNo">354</span>    return construct(comparator, array.length, array);<a name="line.354"></a>
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<span class="sourceLineNo">356</span><a name="line.356"></a>
<span class="sourceLineNo">357</span>  /**<a name="line.357"></a>
<span class="sourceLineNo">358</span>   * Returns an immutable sorted set containing the given elements sorted by<a name="line.358"></a>
<span class="sourceLineNo">359</span>   * the given {@code Comparator}. When multiple elements are equivalent<a name="line.359"></a>
<span class="sourceLineNo">360</span>   * according to {@code compareTo()}, only the first one specified is<a name="line.360"></a>
<span class="sourceLineNo">361</span>   * included.<a name="line.361"></a>
<span class="sourceLineNo">362</span>   *<a name="line.362"></a>
<span class="sourceLineNo">363</span>   * &lt;p&gt;Despite the method name, this method attempts to avoid actually copying<a name="line.363"></a>
<span class="sourceLineNo">364</span>   * the data when it is safe to do so. The exact circumstances under which a<a name="line.364"></a>
<span class="sourceLineNo">365</span>   * copy will or will not be performed are undocumented and subject to change.<a name="line.365"></a>
<span class="sourceLineNo">366</span>   *<a name="line.366"></a>
<span class="sourceLineNo">367</span>   * &lt;p&gt;This method is safe to use even when {@code elements} is a synchronized<a name="line.367"></a>
<span class="sourceLineNo">368</span>   * or concurrent collection that is currently being modified by another<a name="line.368"></a>
<span class="sourceLineNo">369</span>   * thread.<a name="line.369"></a>
<span class="sourceLineNo">370</span>   *<a name="line.370"></a>
<span class="sourceLineNo">371</span>   * @throws NullPointerException if {@code comparator} or any of<a name="line.371"></a>
<span class="sourceLineNo">372</span>   *     {@code elements} is null<a name="line.372"></a>
<span class="sourceLineNo">373</span>   * @since 7.0 (source-compatible since 2.0)<a name="line.373"></a>
<span class="sourceLineNo">374</span>   */<a name="line.374"></a>
<span class="sourceLineNo">375</span>  public static &lt;E&gt; ImmutableSortedSet&lt;E&gt; copyOf(<a name="line.375"></a>
<span class="sourceLineNo">376</span>      Comparator&lt;? super E&gt; comparator, Collection&lt;? extends E&gt; elements) {<a name="line.376"></a>
<span class="sourceLineNo">377</span>    return copyOf(comparator, (Iterable&lt;? extends E&gt;) elements);<a name="line.377"></a>
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<span class="sourceLineNo">379</span><a name="line.379"></a>
<span class="sourceLineNo">380</span>  /**<a name="line.380"></a>
<span class="sourceLineNo">381</span>   * Returns an immutable sorted set containing the elements of a sorted set,<a name="line.381"></a>
<span class="sourceLineNo">382</span>   * sorted by the same {@code Comparator}. That behavior differs from {@link<a name="line.382"></a>
<span class="sourceLineNo">383</span>   * #copyOf(Iterable)}, which always uses the natural ordering of the<a name="line.383"></a>
<span class="sourceLineNo">384</span>   * elements.<a name="line.384"></a>
<span class="sourceLineNo">385</span>   *<a name="line.385"></a>
<span class="sourceLineNo">386</span>   * &lt;p&gt;Despite the method name, this method attempts to avoid actually copying<a name="line.386"></a>
<span class="sourceLineNo">387</span>   * the data when it is safe to do so. The exact circumstances under which a<a name="line.387"></a>
<span class="sourceLineNo">388</span>   * copy will or will not be performed are undocumented and subject to change.<a name="line.388"></a>
<span class="sourceLineNo">389</span>   *<a name="line.389"></a>
<span class="sourceLineNo">390</span>   * &lt;p&gt;This method is safe to use even when {@code sortedSet} is a synchronized<a name="line.390"></a>
<span class="sourceLineNo">391</span>   * or concurrent collection that is currently being modified by another<a name="line.391"></a>
<span class="sourceLineNo">392</span>   * thread.<a name="line.392"></a>
<span class="sourceLineNo">393</span>   *<a name="line.393"></a>
<span class="sourceLineNo">394</span>   * @throws NullPointerException if {@code sortedSet} or any of its elements<a name="line.394"></a>
<span class="sourceLineNo">395</span>   *     is null<a name="line.395"></a>
<span class="sourceLineNo">396</span>   */<a name="line.396"></a>
<span class="sourceLineNo">397</span>  public static &lt;E&gt; ImmutableSortedSet&lt;E&gt; copyOfSorted(SortedSet&lt;E&gt; sortedSet) {<a name="line.397"></a>
<span class="sourceLineNo">398</span>    Comparator&lt;? super E&gt; comparator = SortedIterables.comparator(sortedSet);<a name="line.398"></a>
<span class="sourceLineNo">399</span>    E[] elements = (E[]) sortedSet.toArray();<a name="line.399"></a>
<span class="sourceLineNo">400</span>    if (elements.length == 0) {<a name="line.400"></a>
<span class="sourceLineNo">401</span>      return emptySet(comparator);<a name="line.401"></a>
<span class="sourceLineNo">402</span>    } else {<a name="line.402"></a>
<span class="sourceLineNo">403</span>      return new RegularImmutableSortedSet&lt;E&gt;(<a name="line.403"></a>
<span class="sourceLineNo">404</span>          ImmutableList.&lt;E&gt;asImmutableList(elements), comparator);<a name="line.404"></a>
<span class="sourceLineNo">405</span>    }<a name="line.405"></a>
<span class="sourceLineNo">406</span>  }<a name="line.406"></a>
<span class="sourceLineNo">407</span><a name="line.407"></a>
<span class="sourceLineNo">408</span>  /**<a name="line.408"></a>
<span class="sourceLineNo">409</span>   * Sorts and eliminates duplicates from the first {@code n} positions in {@code contents}.<a name="line.409"></a>
<span class="sourceLineNo">410</span>   * Returns the number of unique elements.  If this returns {@code k}, then the first {@code k}<a name="line.410"></a>
<span class="sourceLineNo">411</span>   * elements of {@code contents} will be the sorted, unique elements, and {@code<a name="line.411"></a>
<span class="sourceLineNo">412</span>   * contents[i] == null} for {@code k &lt;= i &lt; n}.<a name="line.412"></a>
<span class="sourceLineNo">413</span>   *<a name="line.413"></a>
<span class="sourceLineNo">414</span>   * @throws NullPointerException if any of the first {@code n} elements of {@code contents} is<a name="line.414"></a>
<span class="sourceLineNo">415</span>   *          null<a name="line.415"></a>
<span class="sourceLineNo">416</span>   */<a name="line.416"></a>
<span class="sourceLineNo">417</span>  static &lt;E&gt; int sortAndUnique(<a name="line.417"></a>
<span class="sourceLineNo">418</span>      Comparator&lt;? super E&gt; comparator, int n, E... contents) {<a name="line.418"></a>
<span class="sourceLineNo">419</span>    if (n == 0) {<a name="line.419"></a>
<span class="sourceLineNo">420</span>      return 0;<a name="line.420"></a>
<span class="sourceLineNo">421</span>    }<a name="line.421"></a>
<span class="sourceLineNo">422</span>    for (int i = 0; i &lt; n; i++) {<a name="line.422"></a>
<span class="sourceLineNo">423</span>      ObjectArrays.checkElementNotNull(contents[i], i);<a name="line.423"></a>
<span class="sourceLineNo">424</span>    }<a name="line.424"></a>
<span class="sourceLineNo">425</span>    Arrays.sort(contents, 0, n, comparator);<a name="line.425"></a>
<span class="sourceLineNo">426</span>    int uniques = 1;<a name="line.426"></a>
<span class="sourceLineNo">427</span>    for (int i = 1; i &lt; n; i++) {<a name="line.427"></a>
<span class="sourceLineNo">428</span>      E cur = contents[i];<a name="line.428"></a>
<span class="sourceLineNo">429</span>      E prev = contents[uniques - 1];<a name="line.429"></a>
<span class="sourceLineNo">430</span>      if (comparator.compare(cur, prev) != 0) {<a name="line.430"></a>
<span class="sourceLineNo">431</span>        contents[uniques++] = cur;<a name="line.431"></a>
<span class="sourceLineNo">432</span>      }<a name="line.432"></a>
<span class="sourceLineNo">433</span>    }<a name="line.433"></a>
<span class="sourceLineNo">434</span>    Arrays.fill(contents, uniques, n, null);<a name="line.434"></a>
<span class="sourceLineNo">435</span>    return uniques;<a name="line.435"></a>
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<span class="sourceLineNo">437</span><a name="line.437"></a>
<span class="sourceLineNo">438</span>  /**<a name="line.438"></a>
<span class="sourceLineNo">439</span>   * Constructs an {@code ImmutableSortedSet} from the first {@code n} elements of<a name="line.439"></a>
<span class="sourceLineNo">440</span>   * {@code contents}.  If {@code k} is the size of the returned {@code ImmutableSortedSet}, then<a name="line.440"></a>
<span class="sourceLineNo">441</span>   * the sorted unique elements are in the first {@code k} positions of {@code contents}, and<a name="line.441"></a>
<span class="sourceLineNo">442</span>   * {@code contents[i] == null} for {@code k &lt;= i &lt; n}.<a name="line.442"></a>
<span class="sourceLineNo">443</span>   *<a name="line.443"></a>
<span class="sourceLineNo">444</span>   * &lt;p&gt;If {@code k == contents.length}, then {@code contents} may no longer be safe for<a name="line.444"></a>
<span class="sourceLineNo">445</span>   * modification.<a name="line.445"></a>
<span class="sourceLineNo">446</span>   *<a name="line.446"></a>
<span class="sourceLineNo">447</span>   * @throws NullPointerException if any of the first {@code n} elements of {@code contents} is<a name="line.447"></a>
<span class="sourceLineNo">448</span>   *          null<a name="line.448"></a>
<span class="sourceLineNo">449</span>   */<a name="line.449"></a>
<span class="sourceLineNo">450</span>  static &lt;E&gt; ImmutableSortedSet&lt;E&gt; construct(<a name="line.450"></a>
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